Get Unique OID for your custom LDAP schemas or SNMP MIBs or another stuff you like.
There is more than one way to obtain unique OID. You may generate UUID but that is a long number so not every implementation can handle it. You may get private OID via IANA but they processing applications manually so work really slow. You may get unique OID via your local network provider but they work even slower.
Or you may obtain unique OID via quick-oid.org and get an unique OID assigned for free in a moment.